 | Home > Maintenance & Modifications > Dual battery installation - critique my wiring diagram! |
 
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142  
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OK, here goes version 2
 Click image to enlarge Electrical Setup v2 by mikeh501, on Flickr * Got rid of the 400a fuses * Got rid of 1 of the fuse boxes * Got rid of both bus bars * Got rid of the fuse box relay and just put another isolator in. * Changed the 120a ACR for a 500a one. Question: For all the ancillary loads like spotlamps etc, should i bring the earths back to the fusebox or run it into body ground? I guess it depends on the quality of my chassis earth but assume this is good. Im definately bringing back my winch earth back to the battery, its just the rest im wondering about. |
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11th Feb 2013 10:42pm |
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| Luismi Member Since: 04 Nov 2010 Location: Cotswolds Posts: 178  
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Terrific.
Now installation time  |
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11th Feb 2013 11:37pm |
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| Christian Member Since: 23 Feb 2013 Location: Doha Posts: 66  
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Hi Mike,
I' m quite interested in building a similar setup than yours. Any photos of what you finally installed ? Your Flickr photos are no longer accessible, if you don' t mind reviving them
Thanks ! Chris |
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9th Nov 2013 8:13am |
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142
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Hi,
I installed it as per the picture above, which i can see, so not sure whats happened. This one.
Electrical Setup v2 by mikeh501, on Flickr The only change is that i ended up using Optima Bluetop batteries instead of the numax as i couldnt get those to fit. Expensive mistake! Ive got some images of the build, but none of the final product, but i can tell you that its working extremely well and has been battle tested with some big winch pulls out of the muddy stuff 
This was after id stripped it out.
2013-04-01 15.02.19 by mikeh501, on Flickr I then painted the entire interior with compressor and single pack. [/url]
[/url]
Click image to enlarge[/url] Click image to enlarge[/url] Coming together. The bluesea in place and holes made, grommets added. All the major wiring in place ready for final crimping/soldering/heatshrinking etc. [/url]
happy to answer any questions etc. |
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9th Nov 2013 2:33pm |
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| Christian Member Since: 23 Feb 2013 Location: Doha Posts: 66
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Outstanding, thanks a lot for this !
I fancy your isolators, though I'm looking for something that would fit in/on the cubby box... I wish I could find 300A rated relays so I could operate it remotely Unfortunately, this translates into three phase contactors... Chris |
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10th Nov 2013 1:19pm |
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142
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no problem. the isolators are from bluesea. i removed my centre seat and replaced with a cubby box so the isolators can be easily reached from the drivers seat and it means they cant accidently be turned.
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10th Nov 2013 8:10pm |
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| Christian Member Since: 23 Feb 2013 Location: Doha Posts: 66
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Alright, quick question here, before I start my own setup.
As I probably won't get easily a Bluesea ACR here (or not at the right price anyway), I'm looking for an alternative which in my opinion is a simple undervoltage relay that triggers a higher rating relay. My only concern is the way the voltage is monitored. To ensure the alternator has charged the first battery enough, I wait until it reads 13.5 volts on its poles before combining. And then as soon as it drops under 12.35 for more than 10 seconds (meaning the alternator is not effective anymore while loads are present), I isolate the two batteries. Simple. But if we assume the aux battery is low before charging it (which it usually is after a night feeding a fridge, for instance), when the relay will combine the batteries, the voltage read on the sensor will be the average of the two. Isn't there a risk that it makes the relay to open again, thinking the alternator is not working ? The bluesea ACR claims it has a dual sensor, but as soon as you combine both batteries, there is no way to read each battery's voltage,unless there is a diode somewhere... 
Am I being paranoid or do I just miss the point ? Chris |
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14th Nov 2013 7:15am |
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142
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I'm not really sure, but I chose the blue sea controller rather than a cheaper version because of similar concerns. My concern was that in a situation where one battery was at a lower voltage than the other it could cause some large inrush currents especially when winching. These currents could easily be more than 100amps which was the typical size of other voltage sensitive relays I found online. Basically I just bit the bullet and got the proper kit. My blue sea asr is rated for peaks of 2500amp. The blue sea also has the convenience of a dash mounted indicator and switch to for manually separate/combine or automatic.
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14th Nov 2013 7:43am |
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| BigRuss Member Since: 15 May 2010 Location: Norfolk Posts: 2785 
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I would have a chat with Tim at mobile centre, I know he has posted headlights to Azerbaijan in the past
Russell
2011MY 110 XS USW Black |
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14th Nov 2013 8:03am |
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| couplands Member Since: 31 Aug 2011 Location: Peak District & Cornwall Posts: 1826 
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Mikeh501, any chance you can reinstate the photos..?
Cheers Simon |
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31st Oct 2014 8:45am |
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142
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yeah sure. dont know what happened, but ill see if i can upload again.
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31st Oct 2014 5:01pm |
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| couplands Member Since: 31 Aug 2011 Location: Peak District & Cornwall Posts: 1826
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^^^^ cheers...
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31st Oct 2014 5:30pm |
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| pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 
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[quote="mikeh501"]I'm not really sure, but I chose the blue sea controller rather than a cheaper version because of similar concerns. My concern was that in a situation where one battery was at a lower voltage than the other it could cause some large inrush currents especially when winching. These currents could easily be more than 100amps which was the typical size of other voltage sensitive relays I found online. Basically I just bit the bullet and got the proper kit. My blue sea asr is rated for peaks of 2500amp. The blue sea also has the convenience of a dash mounted indicator and switch to for manually separate/combine or automatic.[/quote]
I had they same thoughts, in addition if I ever get an electric winch it will not need upgrading. 
So I ordered up the same one from the Mobilecentre. |
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1st Nov 2014 2:27am |
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| couplands Member Since: 31 Aug 2011 Location: Peak District & Cornwall Posts: 1826
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I think the pictures have disappeared from your Flickr account, so would need restoring there..? Cheers Simon |
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1st Nov 2014 6:57am |
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